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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.security.keystore;
import java.security.Provider;
/**
* {@link Provider} of JCA crypto operations operating on Android KeyStore keys.
*
* <p>This provider was separated out of {@link AndroidKeyStoreProvider} to work around the issue
* that Bouncy Castle provider incorrectly declares that it accepts arbitrary keys (incl. Android
* KeyStore ones). This causes JCA to select the Bouncy Castle's implementation of JCA crypto
* operations for Android KeyStore keys unless Android KeyStore's own implementations are installed
* as higher-priority than Bouncy Castle ones. The purpose of this provider is to do just that: to
* offer crypto operations operating on Android KeyStore keys and to be installed at higher priority
* than the Bouncy Castle provider.
*
* <p>Once Bouncy Castle provider is fixed, this provider can be merged into the
* {@code AndroidKeyStoreProvider}.
*
* @hide
*/
class AndroidKeyStoreBCWorkaroundProvider extends Provider {
// IMPLEMENTATION NOTE: Class names are hard-coded in this provider to avoid loading these
// classes when this provider is instantiated and installed early on during each app's
// initialization process.
private static final String PACKAGE_NAME = "android.security.keystore";
private static final String KEYSTORE_SECRET_KEY_CLASS_NAME =
PACKAGE_NAME + ".AndroidKeyStoreSecretKey";
AndroidKeyStoreBCWorkaroundProvider() {
super("AndroidKeyStoreBCWorkaround",
1.0,
"Android KeyStore security provider to work around Bouncy Castle");
// javax.crypto.Mac
putMacImpl("HmacSHA1", PACKAGE_NAME + ".AndroidKeyStoreHmacSpi$HmacSHA1");
put("Alg.Alias.Mac.1.2.840.113549.2.7", "HmacSHA1");
put("Alg.Alias.Mac.HMAC-SHA1", "HmacSHA1");
put("Alg.Alias.Mac.HMAC/SHA1", "HmacSHA1");
putMacImpl("HmacSHA224", PACKAGE_NAME + ".AndroidKeyStoreHmacSpi$HmacSHA224");
put("Alg.Alias.Mac.1.2.840.113549.2.9", "HmacSHA224");
put("Alg.Alias.Mac.HMAC-SHA224", "HmacSHA224");
put("Alg.Alias.Mac.HMAC/SHA224", "HmacSHA224");
putMacImpl("HmacSHA256", PACKAGE_NAME + ".AndroidKeyStoreHmacSpi$HmacSHA256");
put("Alg.Alias.Mac.1.2.840.113549.2.9", "HmacSHA256");
put("Alg.Alias.Mac.HMAC-SHA256", "HmacSHA256");
put("Alg.Alias.Mac.HMAC/SHA256", "HmacSHA256");
putMacImpl("HmacSHA384", PACKAGE_NAME + ".AndroidKeyStoreHmacSpi$HmacSHA384");
put("Alg.Alias.Mac.1.2.840.113549.2.10", "HmacSHA384");
put("Alg.Alias.Mac.HMAC-SHA384", "HmacSHA384");
put("Alg.Alias.Mac.HMAC/SHA384", "HmacSHA384");
putMacImpl("HmacSHA512", PACKAGE_NAME + ".AndroidKeyStoreHmacSpi$HmacSHA512");
put("Alg.Alias.Mac.1.2.840.113549.2.11", "HmacSHA512");
put("Alg.Alias.Mac.HMAC-SHA512", "HmacSHA512");
put("Alg.Alias.Mac.HMAC/SHA512", "HmacSHA512");
// javax.crypto.Cipher
putSymmetricCipherImpl("AES/ECB/NoPadding",
PACKAGE_NAME + ".AndroidKeyStoreCipherSpi$AES$ECB$NoPadding");
putSymmetricCipherImpl("AES/ECB/PKCS7Padding",
PACKAGE_NAME + ".AndroidKeyStoreCipherSpi$AES$ECB$PKCS7Padding");
putSymmetricCipherImpl("AES/CBC/NoPadding",
PACKAGE_NAME + ".AndroidKeyStoreCipherSpi$AES$CBC$NoPadding");
putSymmetricCipherImpl("AES/CBC/PKCS7Padding",
PACKAGE_NAME + ".AndroidKeyStoreCipherSpi$AES$CBC$PKCS7Padding");
putSymmetricCipherImpl("AES/CTR/NoPadding",
PACKAGE_NAME + ".AndroidKeyStoreCipherSpi$AES$CTR$NoPadding");
}
private void putMacImpl(String algorithm, String implClass) {
put("Mac." + algorithm, implClass);
put("Mac." + algorithm + " SupportedKeyClasses", KEYSTORE_SECRET_KEY_CLASS_NAME);
}
private void putSymmetricCipherImpl(String transformation, String implClass) {
put("Cipher." + transformation, implClass);
put("Cipher." + transformation + " SupportedKeyClasses", KEYSTORE_SECRET_KEY_CLASS_NAME);
}
}
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